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Use the Following Information to Answer the Question

question 19

Multiple Choice

Use the following information to answer the question.
Giardia intestinalis can cause disease in several different mammalian species, including humans. Giardia organisms (G. intestinalis) that infect humans are similar morphologically to those that infect other mammals, thus they have been considered a single species. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics.
In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species. (T. Monis, et al. 1999. Molecular systematics of the parasitic protozoan Giardia intestinalis. Mol. Biol. Evol. 16[9]:1135-44.)

By examining the phylogenetic tree diagrammed in the figure above, what conclusion can you draw about the species G. microti?

Understand the management and implications of acquiring an STI during pregnancy.

Gain insights into counseling and educating patients with sexual health concerns.

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Definitions:

Solve

To find an answer to, explanation for, or means of effectively dealing with a problem or question.

Detailed

Characterized by the provision of comprehensive and thorough information or descriptions.

Objective Study

An investigation or analysis conducted in an impartial and unbiased manner, focusing on factual evidence.